/Engine/Source/Runtime/Engine/Classes/Engine/Level.h
Get the list of (on disk) external actor packages associated with this level
Array of packages associated with this level
[TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > GetOnDiskExternalActorPackages ( bool bTryUsingPackageLoadedPath ) const